TOI-1468: A system of two transiting planets, a super-Earth and a mini-Neptune, on opposite sides of the radius valley

TOI-1468: A system of two transiting planets, a super-Earth and a mini-Neptune, on opposite sides of the radius valley
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TOI-1468:由两个凌日行星组成的系统,一个是超级地球,一个是迷你海王星,位于半径谷的两侧

DOI:
10.1051/0004-6361/202244056
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发表时间:
2022
影响因子:
6.5
通讯作者:
Caballero, J. A.
Caballero, J. A.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Chaturvedi, P.;Bluhm, P.;Nagel, E.;Hatzes, A. P.;Morello, G.;Brady, M.;Korth, J.;Molaverdikhani, K.;Kossakowski, D.;Caballero, J. A.

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我们报告了围绕明亮的 M3.0V 恒星 TOI-1468 (LSPM J0106+1913) 运行的两颗小型凌日行星的发现和特征,它们的凌日信号在 TESS 任务的三个扇区的光度时间序列中检测到。我们使用 CARMENES 和 MAROON-X 摄谱仪的精确径向速度测量来确认它们的行星性质,并通过地面凌日光度测量对其进行补充。对所有这些数据的联合分析表明,周期较短的行星 TOI-1468 b (Pb= 1.88 d) 的行星质量为 Mb= 3.21 ± 0.24M⊕,半径为 Rb=R⊕,导致密度为 ρb= g cm−3,这与主要由岩石组成一致。对于外行星 TOI-1468 c (Pc= 15.53 d),我们得出质量为 Mc=M⊕,半径为 Rc= 2.06 ± 0.04R⊕,体积密度为ρc=g cm−3,这对应于具有 H/He 气体包层的岩石核心成分。这些行星位于半径谷的两侧,这使得我们的系统成为一个有趣的发现,因为只有少数其他系统具有相同的特性。这一发现可以进一步帮助确定 M 矮星周围小行星半径谷的更精确位置,从而为行星形成和演化情景提供更多线索。
We report the discovery and characterization of two small transiting planets orbiting the bright M3.0V star TOI-1468 (LSPM J0106+1913), whose transit signals were detected in the photometric time series in three sectors of the TESS mission. We confirm the planetary nature of both of them using precise radial velocity measurements from the CARMENES and MAROON-X spectrographs, and supplement them with ground-based transit photometry. A joint analysis of all these data reveals that the shorter-period planet, TOI-1468 b (Pb= 1.88 d), has a planetary mass ofMb= 3.21 ± 0.24M⊕and a radius ofRb=R⊕, resulting in a density ofρb= g cm−3, which is consistent with a mostly rocky composition. For the outer planet, TOI-1468 c (Pc= 15.53 d), we derive a mass ofMc=M⊕,aradius ofRc= 2.06 ± 0.04R⊕,and a bulk density ofρc=g cm−3, which corresponds to a rocky core composition with a H/He gas envelope. These planets are located on opposite sides of the radius valley, making our system an interesting discovery as there are only a handful of other systems with the same properties. This discovery can further help determine a more precise location of the radius valley for small planets around M dwarfs and, therefore, shed more light on planet formation and evolution scenarios.
探测系外行星的多普勒方法
DOI: --
发表时间: 2019
期刊:
影响因子: --
作者:
A. Hatzes
通讯作者: A. Hatzes
慕尼黑
DOI: 10.7788/boehlau.9783412217204.127
发表时间: 2021
期刊: Rassismus. Macht. Vergessen.
影响因子: --
作者:
Robert Andreasch
通讯作者: Robert Andreasch